Ben: 'Alright Rika, what's your idea this time? But remember, only "pure science”.'
Rika: 'I suggest one of the basic subjects – Physics. We are going to show everybody how physics relates to everyday life. Is it "pure” enough?'
Ben: 'That sounds good. All my sons will help us. So, let's roll up our sleeves and get to work.'
Rika: 'Maybe Adam should roll up his sleeves and we...'
Ben: 'Rika!'
Rika: 'I know, I know, the brain is the best part of him. Let's start our Physics lesson.'
1. MONDAY
A force is a push or a pull that acts upon an object as a results of its interaction with another object.
Force can cause a resting object to movement:

or it can accelerate a moving object by changing its speed or direction:

What was the acceleration of Joe?

